IMAGES: Boston Marathon explosions

Fans at Fenway Park held up signs to honor the Boston Marathon bombing victims.

People gather at a makeshift memorial for victims near the site of the Boston Marathon bombings a day after the second suspect was captured on April 20, 2013 in Boston, United States.

Mario Tama/Getty Images

Copyright Getty Images

Items including a pair of running shoes have been placed at a makeshift memorial for victims near the site of the Boston Marathon bombings a day after the second suspect was captured on April 20, 2013 in Boston, United States.

Mario Tama/Getty Images

Copyright Getty Images

People kneel at a makeshift memorial for victims near the site of the Boston Marathon bombings a day after the second suspect was captured on April 20, 2013 in Boston, Massachusetts.

Mario Tama/Getty Images

Copyright Getty Images

Items are attached to a fence at a makeshift memorial for victims near the site of the Boston Marathon bombings a day after the second suspect was captured on April 20, 2013 in Boston, United States.

Mario Tama/Getty Images

Copyright Getty Images

People gather at a makeshift memorial for victims near the site of the Boston Marathon bombings a day after the second suspect was captured on April 20, 2013 in Boston, United States.

Mario Tama/Getty Images

Copyright Getty Images

People take photos at a makeshift memorial for victims near the site of the Boston Marathon bombings a day after the second suspect was captured on April 20, 2013 in Boston, Massachusetts.

Mario Tama/Getty Images

Copyright Getty Images

Fans hold a sign to honor the Marathon bombing victims, before a game the Kansas City Royals at Fenway Park on April 20, 2013 in Boston, Massachusetts.

Jim Rogash/Getty Images

Copyright Getty Images

A fans holds a sign outside of Fenway Park tohonor the Marathon bombing victims, before a game the Kansas City Royals at Fenway Park on April 20, 2013 in Boston, Massachusetts.

Jim Rogash/Getty Images

Copyright Getty Images

Fans hold a sign to honor the Marathon bombing victims, before a game the Kansas City Royals at Fenway Park on April 20, 2013 in Boston, Massachusetts.

Jim Rogash/Getty Images

Copyright Getty Images

Fans hold a sign to honor the Marathon bombing victims, before a game the Kansas City Royals at Fenway Park on April 20, 2013 in Boston, Massachusetts.

Jim Rogash/Getty Images

Copyright Getty Images

A fans holds a sign to honor the Marathon bombing victims, before a game the Kansas City Royals at Fenway Park on April 20, 2013 in Boston, Massachusetts.

Jim Rogash/Getty Images

Copyright Getty Images

Volunteers pass out signs to fans to honor the Marathon bombing victims, before a game the Kansas City Royals at Fenway Park on April 20, 2013 in Boston, Massachusetts.

Jim Rogash/Getty Images

Copyright Getty Images

A few of the estimated 200 people who poured onto Hemingway Street in the Fenway neighborhood to celebrate after the announcement earlier of the capture of the second Boston Martathon bombing suspect celebrate April 19, 2013 in Boston, Massachusetts.

Kayana Szymczak/Getty Images

Copyright Getty Images

An estimated 200 people pour onto Hemingway Street in the Fenway neighborhood to celebrate after the announcement earlier of the capture of the second Boston Martathon bombing suspect celebrate April 19, 2013 in Boston, Massachusetts.

Kayana Szymczak/Getty Images

Copyright Getty Images

A few of the estimated 200 people who poured onto Hemingway Street in the Fenway neighborhood to celebrate after the announcement earlier of the capture of the second Boston Martathon bombing suspect celebrate April 19, 2013 in Boston, Massachusetts.

Kayana Szymczak/Getty Images

Copyright Getty Images

An estimated 200 people pour onto Hemingway Street in the Fenway neighborhood to celebrate after the announcement earlier of the capture of the second Boston Martathon bombing suspect celebrate April 19, 2013 in Boston, Massachusetts.

Kayana Szymczak/Getty Images

Copyright Getty Images

Federal agents gather by the home of a suspect-at-large in the Boston Marathon bombing and nearby Watertown shooting.

Darren McCollester/Getty

Copyright Getty Images

Residents and their pets are evacuated as members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter near the home of suspect #2 on Norfolk Street in Cambridge, Mass.

Jared Wickerham/Getty

Copyright Getty Images

A woman reacts while being questioned by the Cambridge Police and other law enforcement agencies on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Mass.

Jared Wickerham/Getty

Copyright Getty Images

Police search for remaining Boston Marathon bombing suspect Dzhokhar Tsarnaev at an apartment building where a resident reported finding drops of blood.

Mario Tama/Getty

Copyright Getty Images

SWAT team members search for one remaining suspect at a residential building in Watertown, Mass.

Mario Tama/Getty

Copyright Getty Images

Boston SWAT team members aim their guns as they search for one remaining suspect at an apartment building in Watertown, Mass.

Mario Tama/Getty

Copyright Getty Images

SWAT team members prepare to search for one remaining suspect at an apartment building on April 19, 2013.

Mario Tama/Getty Images

Copyright Getty Images

Authorities have identified the Boston Marathon bombing suspect still at-large as 19-year-old Dzhokhar Tsarnaev, of Cambridge. Police said he is considered armed and dangerous.

Copyright 2013 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Police walk down School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge.

Darren McCollester/Getty Images

Copyright Getty Images

Police descend on School and Walnut streets in Boston chasing possible suspects.

A woman looks at the blood on her hands as she is loaded into an ambulance after being injured after two bombs exploded on the marathon route in Boston, Massachusetts.

Jim Rogash/Getty Images

Copyright Getty Images

Police and runners stand near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.

Alex Trautwig/Getty Images

Copyright Getty Images

Boston Police stand near the scene of a twin bombing at the Boston Marathon, on April 16, 2013 in Boston, Massachusetts.

Spencer Platt/Getty Images

Copyright Getty Images

A Boston police officer stands near the scene of a twin bombing at the Boston Marathon, on April 16, 2013 in Boston, Massachusetts.

Spencer Platt/Getty Images

Copyright Getty Images

Unclaimed finish line bags are viewed near the scene of a twin bombing at the Boston Marathon, on April 16, 2013 in Boston, Massachusetts.

Spencer Platt/Getty Images

Copyright Getty Images

A police officer directs people around the finish line at the corner of Boylston Street and Massachusetts Avenue after two explosives detonated.

Darren McCollester/Getty Images

Copyright Getty Images

U.S. President Barack Obama speaks about today's bombing at the Boston Marathon, April 15, 2013 in Washington, DC.

Mark Wilson/Getty Images

Copyright Getty Images

The bandaged leg of a man hangs outside an ambulance outside a medical tent located ear the finish of the 117th Boston Marathon after two bombs exploded.

Jim Rogash/Getty Images)

Copyright Getty Images

People gather after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.

Alex Trautwig/Getty Images

Copyright Getty Images

A swat team arrives at the corner of Stuart Street and Dartmouth Street after two explosive devices detonated at the finish line.

Darren McCollester/Getty Images

Copyright Getty Images

The outer perimeter near Massachusetts Avenue and Newbury Street is secured by police after two explosive devices detonated at the finish line.

Alex Trautwig/Getty Images

Copyright Getty Images

The outer perimeter near Massachusetts Avenue and Newbury Street is secured by police after two explosive devices detonated at the finish line.

Alex Trautwig/Getty Images

Copyright Getty Images

National Guard soldiers stand near the scene of a twin bombing at the Boston Marathon, on April 16, 2013 in Boston, Massachusetts.

Spencer Platt/Getty Images

Copyright Getty Images

A man is loaded into an ambulance after he was injured by one of two bombs exploded during the 117th Boston Marathon near Copley Square.

Jim Rogash/Getty Images

Copyright Getty Images

Runners react near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.

Alex Trautwig/Getty Images

Copyright Getty Images

Alex Trautwig/Getty Images

Copyright Getty Images

Runners gather near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.

Alex Trautwig/Getty Images

Copyright Getty Images

Runners gather near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.

Alex Trautwig/Getty Images

Copyright Getty Images

Runners react near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.

Alex Trautwig/Getty Images

Copyright Getty Images

Runners react near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.

Alex Trautwig/Getty Images

Copyright Getty Images

A man is loaded into an ambulance after he was injured by one of two bombs exploded during the 117th Boston Marathon near Copley Square.

Jim Rogash/Getty Images

Copyright Getty Images

A Boston police officer stands near the scene of a twin bombing at the Boston Marathon, on April 16, 2013 in Boston, Massachusetts.

Spencer Platt/Getty Images

Copyright Getty Images

A man is loaded into an ambulance after he was injured by one of two bombs exploded during the 117th Boston Marathon near Copley Square on April 15, 2013 in Boston, Massachusetts.

Jim Rogash/Getty Images

Copyright Getty Images

Unclaimed food sits near the scene of a twin bombing at the Boston Marathon, on April 16, 2013 in Boston, Massachusetts.

Spencer Platt/Getty Images

Copyright Getty Images

Runners listen to directions from a Boston Police officer at the corner of Stuart Street and Dartmouth Street after two explosive devices detonated at the finish line of the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.

Darren McCollester/Getty Images

Copyright Getty Images

Alex Trautwig/Getty Images

Image copyright 2013 Getty Images. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Runners gather near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.

Alex Trautwig/Getty Images

Copyright Getty Images

Runners listen to directions from a Boston Police officer at the corner of Stuart Street and Dartmouth Street after two explosive devices detonated at the finish line of the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.

Darren McCollester/Getty Images

Copyright Getty Images

A runner sits near Kenmore Square after two bombs exploded during the 117th Boston Marathon.

Alex Trautwig/Getty

Copyright Getty Images

Runners talk to Boston Police near Kenmore Square after two bombs exploded.

Alex Trautwig/Getty

Copyright Getty Images

A runner embraces another woman on the marathon route near Kenmore Square after two bombs exploded during the 117th Boston Marathon.

Alex Trautwig/Getty

Copyright Getty Images

A runner reacts near Kenmore Square after two bombs exploded during the 117th Boston Marathon.

Alex Trautwig/Getty

Copyright Getty Images

A member of the bomb squad investigates a suspicious item on the road near Kenmore Square after two bombs exploded during the 117th Boston Marathon.

Alex Trautwig/Getty

Copyright Getty Images

A member of the Boston PD bomb squad investigates a suspicious item on the road near Kenmore Square after two bombs exploded during the 117th Boston Marathon.

Alex Trautwig/Getty

Copyright Getty Images

Getty

Copyright Getty Images

Copyright Associated Press

Copyright Associated Press

Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Copyright 2013 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Copyright 2013 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Copyright 2013 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Copyright 2013 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Copyright 2013 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Copyright 2013 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Copyright 2013 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Copyright 2013 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.